Duplex blow-off valve.



10.858,987. PATBNTED JULY 2, 19o?. G. L. JONES.

DUPLEX BLOW-ORP VALVE. APPLIOATION FILED 23.4.1906.

IV I TN ESSES UNITED STATES PATENT Omron".

GRIFF L. JONES, OF RIDLEY PARK, PENNSYLVANIA, ASSIGNOR OF ONE-HALF TOEDWARD L. DILLMAN, OF JAMAICA, NEW YORK.

DUPLEX BLOW-OFF VALVE Speceation of Letters Patent'.

Patented J'ulyy 2, 902';

Application fue@ April 4,1906.' serial No. 09365.

To all 'whom it' Imay concern:

Be it known that l, GRIFF L. JONES, a citizen of the United States,residing at Ridley Park, county of Delaware, State of Pennsylvania, haveinvented a new and useful Duplex Blow-Off Valve, of which the followingis a specification.

My invention relates to a new and useful blow-off valve and cock whereinI provide two valves operated separately.

It further consists in causing the pressure in the blow-off valve, atall times, to be exerted, in such a manner upon one of the valvestherein as to tend to seat the same.

It further consists of novel details of construction,

' all as will be hereinafter fully set forth.

Figure l represents a sectional view of a blow-off valve and cockembodying my invention. Fig. 2 represents a plan view, with the wheelomitted for clearness. showing a portion broken away and some of theinner mechanism in dotted lines. Fig. 3 represents a sectional view of aportion of a valve showing a slightly different form of the plug valve.Fig. 4 represents a plan view on a reduced scale showing the stopsemployed for preventing improper operation of the device and showing awrench in position on the stem.

Similar numerals of reference indicate corresponding parts in thefigures.

Referring to the drawingsz-l designates the casing of the valve having achamber 2 therein and an inlet port 2 and a discharge port 3 therefor.

4 designates a cap or bonnet which is screwed or otherwise secured tothe casing l, said bonnet being provided with a suitable opening 4X andwith means for receiving suitable packing, hereinafter described.

5 designates an inwardly extending wall or valve seat of the casinghaving a wall 6 connected or integral therewith, between which and thewalls of the casing l is formed an annular chamber 7, said wall 6 beingprovided with suitable ports 8, in the present instance two in number.

9 designates a disk valve which is seated, upon the wall 5 and isrotated thereon, it being understood that the upper face of the wall orvalve seat 5 and the lower face of the disk valve 9 are properly groundand scraped in such a manner as to insure a positive steam-tight seatbetween these parts, to prevent leakage of the fluid, it being notedthat the wall or seat 5 divides the annular chamber 7 from the chamber 2of the casing and that said disk valve 9 is provided with the ports l0,in the present instance two in number, which are adapted to register atthe proper time with the ports ll in the wall or seat 5 of the casing,said ports ll forming a communication between the chamber 2 and theannular chamber 7.

l By reason of the disk valve 9 being so constructed and arranged withrespect to the seat 5, the latter is thoroughly protected at all timesand especially when the valve is discharging, thus preventing wear andconsequent leakage and making an absolutely tight valve.

l2 designates a hollow stem integral with or connected to the disk valve9, said stem l2 being adapted to pass through opening 4 in the bonnet 4and extends through the stuffing box 13 contained in said bonnet 4.Suitably connected with said hollow stem l2 is the hand wheel 14.Passing through said hollow stem 12 -is a stem l5 which is provided withthe squared end 1G, which extends beyond said hollow stem '12. Integralwith or connected to the stem .l5 is a plug valve 17, which is providedwith ports 18, there being two in the present instance, which areadapted to register with the ports 8 in the wall 6, the

lower portion of said plug valve being open and com' municating with thedischarge opening 3 of the casing.

In order to prevent improper operation or manipulation of the parts andin order to insure the movement of the valves to their proper positions,I have provided the bonnet 4 with a stop 19 and a stop 20 at such pointsthereon that a stop 2l located on the wheel 14 will Contact therewith,in order to prevent further movement of said wheel I4 when the ports 'l0in the disk valve 9 are either in open or closed position, that is tosay, when the lug 2l is in engagement with the stop I9, the ports l0 inthe disk 9 are closed and when the wheel I4 is actuated in the directionindicated by the arrow in Fig. 4 and the stop 2l contacts with the stop20, the valves l0 will be in proper register with the ports llin theseat 5. I also provide the wheel 14 with a lug or stop 22, which moveswith said wheel. and on the stem l5, I provide a lug or stop 23, whichis adapted to contact with the lug or stop 22 as shown in Fig. 4, thesaid lugs being so placed that when the same are in the position seen inFig. 4, the plug valve -l7. is in the position seen in Fig. l, that isto say, the ports 8 are closed. lt will be noted further that the steml5 cannot be operated until after the wheel 14 has been operated inorder that the stop 22 will be removed from the path of movement of thestop 23 and that after the stop 22 is moved with the wheel 14, asuitable wrench or tool 24 can be connected with the stem l5 and thisstem can be rotated until the stop 23 again contacts with the stop 22,at which time the plug valve 17 will be in such a position that theports 18 will be in register with the ports 8 and that the blowoff valvewill be open. In order that the valve can be closed, it will be seenthat stem l5 must be rst rotated to remove the stop 23 out of the pathof the stop 22, or in other words, the plug valve 17 must first beclosed before the disk valve is closed.

The operation of the device is as follows The parts I being in theposition seen in Fig. 1, the blow-off' valve is closed and the pressureof the fluid passing in the inlet 2 will be upon the top ofthe diskvalve 9 tending to seat the same and' hold it in proper position. Whenit is desired to open the valve the hand wheel 14 is rotated a properdistance in order to turn the stem 12 and with it the disk valve 9 untilthe ports 10 therein register with the ports 11 in the inwardlyextending wall 5, the fluid being thus admitted into the annular chamber7, it being noted, however, that the pressure still remains upon the topof the disk valve 9. The stem 15 is now rotated in order to cause theplug valve 17 to rotate and cause the openings or ports 18 therein toregister with the ports 8, at which time the fluid can pass from theannular' chamber 7 through the plug valve 17 to the discharge 3, fromwhence it can be conducted to any suitable point. When it is desired toclose the valve the stem 15 must .first be operated to close the ports8, after which the disk valve 9 is operated to close the ports 11.

The operation of the stops it is believed will be thoroughly understoodfrom the description already given and therefore, I have not repeatedthe same in the operation.

It will be seen from the construction shown in Fig. l that the plugvalve 17 is provided with inclined walls to correspond to theinclination of Walls 6, the larger portion of the valve in this figurebeing at the upper side.

In the construction shown in Fig. 3 l have shown the inclination of thewalls of the plug valve reversed from that shown in Fig. 1 and theinclination of the walls 6 with which the plug valve contacts isinclined to correspond to the inclination of Walls oi the plug valve,the discharge opening in this case being made large enough to permit theinsertion and removal of the plug valve 17 which thus can beaccomplished without disturbing the disk valve 9 and as there would becomparatively no wear upon said disk valve 9 since the pressure, asalready explained, will be upon the upper surface thereof, the portionoi the blow-off valve which will be most liable to damage or which willrequire regrounding; will be the plug valve 17 and in the constructionshown in this figure, the said plug valve can be removed withoutremoving the pressure from the disk valve 9 or in other words, the plugvalve can be removed, ground, and replaced While the blowoff valve isunder pressure.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is zd l. In a blow-off valve, and cock, a diskvalve upon the upper surface of which the pressure of the steam isadapted to act, means for operating said disk valve and a plug valvehaving means for operating the same, said plug valve controlling thedischarge opening of the blow-od valve and said disk valve controllingthe inlet of the blow-0E valve.

2. In a device of the character described, a casing, a diskyalve locatedin said casing and upon which the pressure is applied tending to seatthe same, a plug valve located in said casing, and separate means foroperating said valves independently of said casing.

Si. In a device of the character described, a casing having a valve seattherein forming chambers on opposite sides, said' seat having portstherein, a disk therefor on said seat Vand adapted to receive thepressure upon its upper surface, a plug valve controlling the outletfrom one of said chambers, and independent means for operating saidvalves.

4. In a device of the character described, a Ycasing having inlet anddischarge ends, a seat in said casing having passages forming thecommunication between the inlet and discharge ports, a disk valve insaid casing and on said seat and controllingthe passage therein, a plugvalve in said casing controlling theKdischarge port, and separate meansfor operating said valves independently of said casing.

5. In a device of the character described, a casing, havY ing inlet anddischarge ports, a seat in said casing dividing the same into inlet andoutlet chambers, said seat having ports therein, a disk valve on saidseat and having ports adapted to register with the ports in said seatand being so situated as to receive the pressure upon its upper surface,a plug valve controlling the ports of said discharge chamber, separatemeans for operating said valves, and stops in connection with saidoperatingl means being so situated as to prevent improper operation ofthe valves.

(i. In a blow-off valve, and cock, a disk valve upon which the pressureis so applied as to tend to seat the same, means for operating said diskvalve, a plug valve, separate means for operating the same, and meansfor preventing improper operation of said valves.

7. In a blowott valve and cock, a disk valve upon which the pressure isso applied as to tend to seat the same, means for operating said diskvalve, a plug valve, separate means for operating the same and stops sosituated as to prevent improper operating oi the valves.

8. In a device of the character described, a casing having inlet anddischarge ports, a disk valve controlling said inlet port, a sleevecarried by said valve and adapted to be engaged for operating said diskvalve, a plug valve located in said casing, and a stem on said valveprojecting through said sleeve and adapted to be engaged to operate saidplug valve.

GRIFF 'n JoNns.

Witnesses .Toi-1N A. WIEDERSHEIM, C. D, MCVAY.

